BBA

Hello Abhinesh,
Yes dear, definitely you can do your BBA in Australia. Scholarships can be availed from the university if they find you brilliant. Very good grades, say above 70% or 8 out of 10 CGPA in your 10+2, IELTS of 6.5 and higher, letters of recommendation and a convincing statement of purpose are essential. You should check the university's website for the university specific eligibility. Here is a website you can check:
http://www.scholars4dev.com/4950/australia-scholarships/

Dear Muskan Arora,
Take UGAT exam to join BBA with good institutes or two days back IIM-Indore announced their integrated MBA programme. Apply for it and write an entrance test or you can join with the good degree college for your graduation. All the best.

Dear Harshat Chouhan,
SJES Educational Institute is one of the best institute and BBA is getting the highest salary package as 5.2 lakhs per annum. Therefore, you can prefer it.
All the best.

Dear Garima Dudhoria,
Chandigarh University is one of the best and beautiful universities. Excellent infrastructure, good faculty and placements, etc. You can go for it. All the best.

Some known colleges for BBA-Aviation are-
School Of Airlines and Travel Management-Kochi
Flying Goose Aviation Academy-Kochi
National College of Aviation-Chennai
Yashwantrao Chavan Maharashtra Open University-Nashik

BMCC, Symbiosis, Amity are decent college for BBM or BBA. Check others in below list provided:
http://m.htcampus.com/mba/bba-bbm-management-colleges-in-pune/

You can get all the details on eligibility and scope of this course below plus list of top colleges:
http://www.apnaahangout.com/bba-in-airport-management/

Most of the universities conduct entrance examinations for admission in BBA. You are eligible to seek admission in BBA and gap years will have no impact on your selection for BBA degree course subject to you meeting other criteria of your university of choice.

BBA provides exposure to all management functions and is a professional job oriented degree. As your long-term career goal is to do MBA, it is recommended that you opt for BBA which aligns more with your long-term career objectives & goals in comparison to BCA.